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| Title: | Microstructure, phase transition, and electrical properties of (K[sub 0.5]Na[sub 0.5])[sub 1-x]Li[sub x](Nb[sub 1-y]Ta[sub y])O₃ lead-free piezoelectric ceramics | Authors: | Lin, D Kwok, KW Chan, HLW |
Issue Date: | 3-Aug-2007 | Source: | Journal of applied physics, 3 Aug. 2007, v. 102, 034102, no. 3, p. 1-7 | Abstract: | Lead-free ceramics (K[sub 0.5]Na[sub 0.5])[sub 1−x]Li[sub x](Nb[sub 1−y]Ta[sub y])O₃ have been prepared by an ordinary sintering technique. Our results reveal that Li[sup +] and Ta[sup 5+] diffuse into the K[sub 0.5]Na[sub 0.5]NbO₃ lattices to form a solid solution with a perovskite structure. The substitution of Li[sup +] induces an increase in the Curie temperature (T[sub C]) and a decrease in the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature (T[sub O-T]). On the other hand, both T[sub C] and T[sub O-T] decrease after the substitution of Ta[sup 5+]. A coexistence of the orthorhombic and tetragonal phases is formed at 0.03<x<0.06 and 0.10<y<0.25 near room temperature, leading to significant enhancements of the piezoelectric properties. For the ceramic with x=0.04 and y=0.225, the piezoelectric properties become optimum, giving a piezoelectric coefficient d₃₃=208 pC/N, electromechanical coupling factors k[sub p]=48% and k[sub t]=49%, remanent polarization P[sub r]=14.2 µC/cm², coercive field E[sub c]=1.21 kV/mm, and Curie temperature T[sub C]=320 °C. | Keywords: | Crystal microstructure Ferroelectric Curie temperature Ferroelectric materials Lithium compounds Piezoceramics Piezoelectric materials Potassium compounds Sintering Sodium compounds |
Publisher: | American Institute of Physics | Journal: | Journal of applied physics | ISSN: | 0021-8979 | EISSN: | 1089-7550 | DOI: | 10.1063/1.2761852 | Rights: | © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in D. Lin, K.W. Kwok, & H.L.W. Chan, J. Appl. Phys. 102, 034102 (2007) and may be found at http://link.aip.org/link/?jap/102/034102 |
| Appears in Collections: | Journal/Magazine Article |
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